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I have a desktop dell I have a problem with my system startup it shows a massage which is (cmos checksum error defult loaded) and I can't press F1 the keyboard also not working so what should i do to troubleshoot this problem thank you so much

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I gues u will have to replace the cms battery on ur computer motherboard.... it looks like a big watch battery...

Posted on Mar 17, 2011

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I think you have a corrupt BIOS, try changing the CMOS battery first of all
if the computer is unusable (you dont get any further than this error) you may have to remove the bios chip and reprogram it with the latest bin file and an eprom programmer.
if the computer is operational, try installing the latest bios by following the instructions upon download.

Posted on Mar 17, 2011

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Dell Inspiron 530. At start up gives CMOS checksum error defaults loaded. Options press F1, F2 or F12 computer does not react. Has new CMOS battery. RAM OK. Did CMOS clear and password reset. What else can...


When a Power Supply is plugged into power, there is a constant 5 Volts present. The 5 Volt Standby Power.

You press the Power On button.
This in turn presses against the Power On switch, located inside it's plastic assembly.

The Power On switch is a Momentary Contact Switch.
Temporary closing it activates the Soft Power On circuit.
A 5 Volt circuit that utilizes the 5 Volt Standby Power.

The Soft Power On circuit 'excites' the Power Supply, and turns it on.
(Sounds like a seedy novel)

The first chipset (Integrated Circuit) to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.

A checksum is computed as an error-detecting code, to protect the BIOS settings stored in CMOS.
Each time the computer is turned on, this number is re-computed; and checked against stored values.

If they do not match an error message is generated, to tell you the CMOS memory contents may have been corrupted; and therefore some settings may be wrong.
Your BIOS assumed the settings were incorrect, and loaded BIOS default settings; stored in BIOS.

(Default = factory settings)

CMOS Checksum Error Defaults - Loaded

New battery? Nope didn't help.
Clear CMOS, and password reset? Nope didn't help.

Leaves Virus as the problem, or hardware component/s on motherboard; are bad.

My thoughts?
Bad motherboard.

("BAD motherboard. NO,...........you know you have been bad,....don't give me that look. You're a bad motherboard."

Lol!)

That's my diagnosis.


(Unless you put the CMOS battery in upside down.
+ goes UP)

Regards,
joecoolvette

Mar 17, 2013 | Dell Computers & Internet

2 Answers

A 1xx POST error code indicates a problem with the ??


It indicates a problem with the system boards. For more info, start here.

Oct 30, 2012 | HP Computers & Internet

1 Answer

Cmos checksum error-defaults loaded


This error is not the same as a CMOS Checksum Error, which refers to corrupted values of the CMOS settings, the ones you set through the BIOS setup program.
This error means the contents of the BIOS code itself are damaged.

The BIOS ROM chip on the motherboard is probably faulty.
It could also be another component on the motherboard.

Make sure the battery has plenty charge or remove the battery for a while, about 5 minutes to see if that restores it some motherboards cmos batteries are soldered in

You could check the site for the machine vendor to see if there is a reset jumper.

If that doesn't work then you will need to refresh the BIOS


You should make sure that all of the BIOS settings in the system are correct, by rebooting the system, going into BIOS setup and double-checking all the values hopefully against a recent


If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS.

To do that you need to press a key while the computer is booting Usually the Delete or F2 but can be other keys
It should tell you on the bottom of the first screen which key to press to enter BIOS setup.


If you don't know the settings the should be one for optimal defaults - use that one.
You will also need to reset the time and date.
.

In the main or system setup screen you should be able to see the date and time Using your arrow keys navigate to the date and change the date. Once highlighted on the month, day, or year, press your arrow keys or your page up / page down keys to change the date.

Press F10 Save, Exit and re-boot and everything should then work
hope this helps

Aug 03, 2012 | Dell Computers & Internet

1 Answer

Cmos checksum bad Chassis Intruded Fatal Error System Halted!


Hi,
To remove CMOS Checksum error, you have to remove the coin cell battery from the motherboard and install a fresh one. A coin-cell battery (CR2032) usually powers the real-time clock and CMOS memory. The battery is 3 Volts, 3/4" in diameter and has an estimated life of three years. When the computer is plugged in, the standby current from the power supply extends the life of the battery.
Just open the desktop, locate the CMOS (Coincell) and remove using screw driver. Replace the battery with CR2032 or an equivalent one.The following brands are used interchangeably for this item: Energizer (ECR2032), Duracell, Panasonic, Eveready, and 3M etc, which can be purchased from any local electronics store.
For Chasis Intrusion msg, go to the BIOS (when prompted, press the Function Key at the system startup) and locate the option of chasis intrusion option and disable it, save settings. Commonly, to enter the BIOS you have to press F2, F10 or DEL Key, depending up the make/ model of the PC you have.

Hope it helps! Good Luck! Thanks for using Fixya!
CreativeTECH

Oct 08, 2011 | Computers & Internet

1 Answer

Hi Everybody, My server Power Edge 650 asking to press F1 during every startup. How to get rid of this. Thanks Ezhilmani


Hi There.

Symptoms
* cmos checksum error messages
* error with date time error

Solution
* Replace CMOS battery.

Procedure

1. Locate your CMOS battery.


pcsyke_74.jpg

2. Turn of your Desktop.
3. Remove the power cable from your Desktop.
4. Press power button to discharge your Desktop from electricity.
5. Desktop should be laid down horizontally.


pcsyke_71.jpg

6. Remove the battery and avoid forcing.
7. Replace the battery with same model or equivalent.
8. Put the new battery firmly in the allocated slot. (Positive side should be visible).
9. Plug the power cabe and start up your PC.
10.Enter Bios by pressing DELETE or F2 and load defaults save and quit, it will reboot automatically.
11.Enter Bios modify settings save and quit.
12.The End

Hopefully this information helps.
Thank you for using FixYa.

Jul 19, 2011 | Dell Poweredge 650 - P4 3.0GHZ, 1GB/40GB...

3 Answers

Cmos checksum error defult loaded dell keyboard not working


Hello There and Welcome to FixYa.

This has been a common problem for desktops, especially those ones that have been in use for more than a year or so. The error simply states that there is no enough power to "recall" all saved BIOS/CMOS settings during POST (Power On Self Test) - these happens when you turn on your PC.

Every motherboard is equipped with a battery that supplies power to load all saved settings, et al. So simply put, your motherboard's battery needs replacement. As soon as this is done, then the error goes away. Your DELL system was not specified when you posted the problem, so for more information, I recommend that you visit DELL's support page here :

support.dell.com

Hope this helps, and Thank you for using FixYa.

Mar 17, 2011 | Computers & Internet

1 Answer

Cmos checksum error 0251


just replace the "CR2032 battery" in the motherboard... the enter the BIOS, then "LOAD SETUP DEFUALT"

May 18, 2009 | E-Machines T2682 (000002965) PC Desktop

1 Answer

CMOS checksum error


Can you leave a better description of the problem?, are you getting 'cmos checksum error' msg when you startup? If so, this is normal after removing the CMOS battery and replacing, it should only display error msg after 1st start then no more...

Dec 30, 2008 | ASUS A8N5X Motherboard

1 Answer

Asus motherboard bios version1104


Whether it shows your cmos checksum error press F1 to continue or f2 to load default.? If this is the problem than kindly switch off the system check for the cmos battery and change the cmos battery and set the date and time properly in the bios and save it by pressing F10.This will resolve your problem.and if not than check the jumper setting on the motherboard is it set to clear cmos and if so kindly remove and set it properly to adjacent jumper ok. Have a nice time.

Dec 04, 2008 | Computers & Internet

1 Answer

Bios get Default


reset to factory settings by removing the battery and then re-insert after a few minutes.

Aug 14, 2008 | Computers & Internet

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